KCallie "Informed moves involve taking gains when a stock has gained for you and buying after an otherwise good company has had a rough period or after a sector has had a rough period that you think will pass and so currently you think the stocks are undervalued for the long term."
In your example you have assumed that two disparate conditions are identical. I disagree.
"[T]aking gains when a stock has gained for you" is a fact. You know your cost basis. You know the current price. You can take a profit. You're assuming, of course, that the price will not go higher. Nevertheless, you are acting on known facts.
"[Y]ou think the stocks are undervalued for the long term". That implies you can forecast the future.(1) You surmise the stock's price has dropped only because it's sector is out of favor. (2) You surmise the stock will do well in the future. (3) You surmise that the stock's price will increase in the future because other investors will agree with your assessment of (1) and (2).
You are making a lot of suppositions when your investment is in an individual stock.
I would be much more inclined to agree with your second series of suppositions if you were describing investing in an asset class, as opposed to investing in an individual stock. There is a lot of data to support the idea that asset classes wax and wane over time, whereas one never knows if an individual stock will recover.
I fully admit that you may not be able to hold on until a specific asset class returns to favor, but that does not negate the fact that the chance of making some positive return is much more likely if you invest in an asset class than if you invest in an individual stock.
Mike